A welding structure of a press-formed part made by combining and joining two parts formed by press-forming and each having an opening portion on at least one side of a cross-section, while the opening portions face each other, and includes a step portion that is provided by forming a bent projection projecting outwardly on a tip end portion of a side wall portion of a lower side part, partially or entirely on a joining surface. A tip end side of the step portion is fitted into the opening portion of an upper side part, and the step portion of the lower side part and the tip end of a side wall portion of the upper side part are linearly joined by arc welding.

In a method for defining welding parameters for a welding process on a workpiece, a welding torch fastened to a robot is guided over the workpiece along a predetermined welding path and predetermined welding parameters for processing the workpiece are set as a function of the position along the welding path. A welding device carries out a welding process. For the more exact definition of the welding parameters, before the welding process is carried out, at least one parameter representing the cooling is recorded as a function of the position along the welding path, and the at least one parameter representing the cooling along the welding path is considered for the welding process when defining optimized welding parameters as a function of the position along the welding path.

In a method for defining welding parameters for a welding process on a workpiece, a welding torch fastened to a robot is guided over the workpiece along a predetermined welding path and predetermined welding parameters for processing the workpiece are set as a function of the position along the welding path. A welding device carries out a welding process. For the more exact definition of the welding parameters, before the welding process is carried out, at least one parameter representing the cooling is recorded as a function of the position along the welding path, and the at least one parameter representing the cooling along the welding path is considered for the welding process when defining optimized welding parameters as a function of the position along the welding path.

A metal-cored electrode for welding to form a weld bead on a ferrous material, which weld bead includes at least 35 wt. % nickel. The metal-cored electrode includes a metal sheath surrounding a core. The core includes greater than 35 wt. % nickel.

A metal-cored electrode for welding to form a weld bead on a ferrous material, which weld bead includes at least 35 wt. % nickel. The metal-cored electrode includes a metal sheath surrounding a core. The core includes greater than 35 wt. % nickel.

The present invention discloses a control device and method for formation of a weld seam based on frontal visual sensing of a weld pool. In the present disclosure, structural light is adopted to irradiate the concave surface of the weld pool, and a visual sensor is adopted to acquire corresponding structured light images. The weld pool depression feature is acquired through image processing. The welding current is adjusted in real time to maintain the weld pool depression feature constant, and thus the uniform backside width of the weld seam can be acquired to achieve uniform and consistent penetration of the weld seam. The present disclosure only relies on the structural light information on the topside of the weld pool to achieve the control of formation of the weld seam and can be applied to the filler-wire-free DC gas tungsten arc welding of tight butt joints.

The present invention discloses a control device and method for formation of a weld seam based on frontal visual sensing of a weld pool. In the present disclosure, structural light is adopted to irradiate the concave surface of the weld pool, and a visual sensor is adopted to acquire corresponding structured light images. The weld pool depression feature is acquired through image processing. The welding current is adjusted in real time to maintain the weld pool depression feature constant, and thus the uniform backside width of the weld seam can be acquired to achieve uniform and consistent penetration of the weld seam. The present disclosure only relies on the structural light information on the topside of the weld pool to achieve the control of formation of the weld seam and can be applied to the filler-wire-free DC gas tungsten arc welding of tight butt joints.

Welding A welding apparatus is provided for welding a weld seam, in particular a root weld seam, with a reversing welding wire the advancing rate, V.sub.D, of which is automatically reduced to a specified minimum rate value, V.sub.Dmin, by a controller of the welding apparatus if no short-circuit, KS, is detected during an arcing phase within a specific time period, Δt, or within a specific extension, Δs, of the welding wire.

Welding A welding apparatus is provided for welding a weld seam, in particular a root weld seam, with a reversing welding wire the advancing rate, V.sub.D, of which is automatically reduced to a specified minimum rate value, V.sub.Dmin, by a controller of the welding apparatus if no short-circuit, KS, is detected during an arcing phase within a specific time period, Δt, or within a specific extension, Δs, of the welding wire.

A bead appearance inspection device includes an acquisition unit that acquires input data related to a welding bead, a storage unit that stores a first determination standard and a second determination standard used for an inspection of a defect of the welding bead, a first determination unit that executes a first inspection determination on the welding bead, and k second determination units, where k is an integer of 1 or more, that execute a second inspection determination on the welding bead. An appearance inspection result of the welding bead is created and output by using a determination result indicating whether a first inspection result acquired by the first inspection determination satisfies the first determination standard and a determination result indicating whether a second inspection result satisfies the second determination standard.